Malicious PDF — malware analysis report

Static analysis result for SHA-256 5527d63117a5b31d…

MALICIOUS

PDF

47.5 KB Created: 2020-08-04 19:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9dd6223aa256add911d8e2a1e43cf17 SHA-1: 243aa07c44b33e090945023f7e5fecc1d201bd79 SHA-256: 5527d63117a5b31dd0a2e2ae7647e4eb63e91980a5717dba9a7661b894063501
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the text 'Adding text to pdf online' and the URL https://ttraff.cc/pify?keyword=adding+text+to+pdf+online, suggesting a lure related to document manipulation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=adding+text+to+pdf+online
    • http://files.foodjourneywithraul.com/uploads/1/3/0/7/130775672/worawuj-pamaworere-xapuwavamos.pdf
    • http://files.westwoodmun.com/uploads/1/3/1/4/131407802/5884166.pdf
    • http://files.wendymockler.com/uploads/1/3/0/9/130968962/7b81d8dd1.pdf
    • http://files.doaprowrestling.com/uploads/1/3/1/6/131606111/definunipumus-seketomawom.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/giratekolara.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/adobe_readr_7._0.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/70067665349.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/jowatedusul.pdf
    • https://cdn.shopify.com/s/files/1/0430/4204/6103/files/30240119613.pdf
    • https://cdn.shopify.com/s/files/1/0434/4587/8950/files/vazujejusovujumotax.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2822/files/catia_drafting_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/87004782495.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/metutoriwaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/16726849409.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/tidapop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d3a.bin
7bcfb553caff65889d7ceed579064a4284ef7fa06bc12ba2ec294dfaf441deb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3A 4784 bytes
font_01_sfnt_off00008da6.bin
994b6716478a6a757a7cbe0d4a3cf8e9ef12c78d4da77459cbc843e98894ecaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA6 10420 bytes